In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

John,

fortunately, this is not the case. The first four bits in the EEPROM's control word are 1010, so let your slave SXes just decode some other bit pattern that is unique on the bus, i.e. not decoded by any other device plus three bits with patterns unique to each SX, for example 1111000x 1111001, 1111010, up to 1111111x, and you can have eight SXes acting as slaves on the bus when the master sends a control byte starting with 1111 in this example. The EEPROM will not answer because it only "listens" to commands starting with 1010.

A while ago, I have developed a system similar to this with up to 5 SXes on one bus. In this system, each of the SXes could act as master and slave, therefore I also had to handle bus arbitration but it worked nicely in the end.

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